CX. Foo.

Well, another approach would be to leave the stock harness in place and do the wire lengthen, plus drop the vtec wires in place - add to the harness. There are easy obd1 subharnesses available like this one: http://www.boomslang.us/extension.htm

Then, you can get an extension on ebay and wire into the extension harness. Personally, I hate removing wiring harnesses. On my 91 integra, removing the harness was a complete nightmare.

Incidentally.. is the cx multi-point or anything nuts like that? ie. does it have 4 injectors? If not, maybe the full gsr harness isn't such a bad idea. But, of course.. if that's the route.. hope you have your helm manuals for wiring diagrams.